If you want to change the LMSKU for a listing, follow these instructions:
Step 1: You will click on the SKU under your title.
Step 2: Once on the Product page, delete the existing LMSKU and input the updated LMSKU you will use to identify your product:
Step 3: Save your listing details.
Reminder: Listing Mirror will not change existing live marketplace SKUs. Changing your LMSKU is only changing the internal identifier for your product and will only affect listings created AFTER the change is made.